Improved glass-mould



ttl

@jf-its.

J. C.' SCHAFFER, OF ROCHESTER, NEW YORK.

Lette/rs Patent No. 87,795, dated March 16, 1869.

IMPROVED GLASS-MOULD.

To all whom #may concern:

vBe it known' that I, J. C. SCHAFFER, of the city of Rochester, in the State of New York, have invented a new and useful Glass-Mould; and I do hereby declare that the following is a full, clear, and exact description thereof', referencebeing had to the accompanying drawing, making part of this specification, in which- Figure 1 is a vertical elevation of the inner face of one-half of a glass-mould.

Figure 2 is an inverted view of thebottom of onehalf of a glass-mould.

The nature of this invention is to provide a method of attaching the bottom to a glass-mould.

By thepresent mode, the bottom, a, is attached to the mould b by putting rivets through the flange e and the bottom. By this means, as the mould heats, the unequal expansion of the rivets and moulds will loosen the rivets, and break them, allowing the bottom to be displaced, which will prevent the parts of the mould from registering when brought together.

My mould is made in parts, as is usual in moulds of `this class.

The bottom is attached to the mould by forming a dovetail groove, x, in the bottom, which is made 'circular, as shown in iig. 2. l

On the bottom of the mould, I form a circular dovetail tongue, f, fig. 1, to fit the dovetail groove x, in the bottom. The groove and tongue may be formed either in the mould or bottom, and may be T-shape, or in any of the known forms of dovetails.

' even.

The moulds and bottoms being in parts, all that is necessary to connect them is to enter the tongue of one part-of the mould into thcgroove o f one part of the bottom, and turn the top until the faces of .both are This makesv a solid attachment between them.

By this arrangement, the metal being the same in all the parts, there is no unequal expansion, and the bottom cannot be detached by that means, as happens in the old arrangement. I.

A movable dowel-pin may be put through the bot- `tom into the. mould, to keep them in position.

If at any time it is necessary to removethe bottom, to repair the mould, it -is easily donekby drawing out the dowel-pin, andturning the bottom around until it is separated fro'm the mould.

The blowover, or top of a glass-mould, may be attached in the same manner, by a dovetail grooveand tongue.

What I claim as my invention, and desire' to secure by Letters Patent, is-

A glass-mould, having the bottom attached thereto by means of a dovetail groove and tongue, substantially as herein shown and described, and for the purpose set orth.

J. G. SCHAFFER.

Witnesses JAs. LoRnNzo GAGE, R. B. WlLLIs. 

